Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.

User Name:

Password

Please enter a password for your user account. Note that passwords are case-sensitive.

Password:

Confirm Password:

Email Address

Please enter a valid email address for yourself.

Email Address:

Insurance

Please select your insurance company (Optional)

Log-in

User Name

Remember Me?

Password

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Additional Options

Miscellaneous Options

Automatically parse links in text

Automatically embed media (requires automatic parsing of links in text to be on).

Automatically retrieve titles from external links

Topic Review (Newest First)

06-29-2012 07:29 AM

big gear head

The 8.5 corporate rear end uses the same 3 series differential for all gears from 2.73 to 5.13. The 2.56 to 2.14 gears use a 2 series differential. It would be much easier for you to find a complete rear end with the gears that you want instead of trying to change the gears in the one that you have. You can not simply take a set of gears out of one rear end and bolt them into another without setting the pinion depth, bearing preload and backlash.

06-25-2012 08:49 PM

boilernspector

Rusthater

Thanks for the info.....

06-25-2012 08:02 PM

rusthater89

It might not fit right because the pinion gear will be too big when changing the gears to a ratio that is numerically lower. You may need a new carrier.

06-25-2012 04:18 PM

boilernspector

Thanks, I'll have to think about that one.....

06-23-2012 04:05 PM

bullheimer

http://www.ringpinion.com/ and go to calculator. if you are using a truck rear end you might not even be able to get higher gears like that 2:73 so check what's available. i think under 3 would be a mistake. thought about taller tires?

06-23-2012 11:21 AM

boilernspector

Blazer gear ratio change for Chevy 292

I have a rat rod with a 1995 Blazer 8.5-10 bolt rear end, with G-80 Eaton limited slip,3:72 gears. This is matched up to a Chevy 292 with a 3 speed Saginaw tranny.
This setup is to low for cruising. 55mph=2500 rpm, I was thinking of changing the rear end gears to a 2:73 or 3:08. Any help/ideas,suggestions would be appreciated......